定義

• Heavy Goldplate.  A special goldplating in which a tiny amount of silver – as one part per 50 of gold – is introduced into the electrolysis to effect a harder gold surface; also called bright plating or hard goldplate. The gold color is unaffected by the silver but the wearing qualities are increased considerably. It is commonly employed in the jewelry field and such items may be marked with the abbreviation hgp. The process can be such that an anode of silver is introduced into the goldplating tank near the end of the plating. Such a plating process was developed near the end of the 19th and beginning of the 20th century by Tiffany & Co.; other jewelry manufacturers following shortly thereafter.

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

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